BG
Bruce Griffiths
Mon, Feb 8, 2010 12:45 AM
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Jugesdidier@cox.net
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
Didier KO4BB
------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: SAL CORNACCHIAsalccor@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bob Camplists@cq.nu
To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there over
most of the sweep.
Bob
From: "SAL CORNACCHIA"salccor@rogers.com
Sent: Sunday, February 07, 2010 11:06 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo..com>
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: "Stan, W1LE"stanw1le@verizon.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
> Hi Didier,
>
> When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
> Best regards,
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: Didier Juges<didier@cox.net>
> To: Time-Nuts<time-nuts@febo.com>
> Sent: Sun, February 7, 2010 11:51:15 AM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
>
> Didier KO4BB
>
> ------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
>
> -----Original Message-----
> From: SAL CORNACCHIA<salccor@rogers.com>
> Date: Sun, 7 Feb 2010 08:42:49
> To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Hi Bob,
> The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
> Best regards,
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: Bob Camp<lists@cq.nu>
> To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
> Sent: Sun, February 7, 2010 11:26:16 AM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Hi
>
> The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
> sweep of the trigger from about 1.5 to 3.5 volts should show it there over
> most of the sweep.
>
> Bob
>
> --------------------------------------------------
> From: "SAL CORNACCHIA"<salccor@rogers.com>
> Sent: Sunday, February 07, 2010 11:06 AM
> To: "Discussion of precise time and frequency measurement"
> <time-nuts@febo..com>
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
>
>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: "Stan, W1LE"<stanw1le@verizon.net>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts@febo.com>
>> Sent: Sun, February 7, 2010 10:47:42 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hello Sal,
>>
>> What are you monitoring the PPS output with ??
>>
>> It is a short duration pulse.
>>
>> What does the TboltMON software (available at the trimble website) show ?
>>
>> What does Lady Heather indicate ?
>> (She is just waiting to massage your numbers.)
>>
>> Stan, W1LE
>>
>>
>>
>>
>
BG
Bruce Griffiths
Mon, Feb 8, 2010 1:17 AM
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19)
connected in parallel with a small series resistor between the parallled
inverter outputs and the PPS connector.
Open the case and check the waveforms at the 74AC04 inputs and outputs.
Check the series resistor for continuity, also check the solder joint
between the BNC inner conductor and the PCB.
Bruce
Bruce Griffiths wrote:
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms termination is switch on the oscilloscope there is
a tiny positive dot deflecting every second, it appears to have a
very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Jugesdidier@cox.net
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver
is pretty beefy, the amplitude does dot drop appreciably when loaded
with 50 ohms on mine.
Didier KO4BB
------------------------ Sent from my BlackBerry Wireless thingy
while I do other things...
-----Original Message-----
From: SAL CORNACCHIAsalccor@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency
measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a
very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bob Camplists@cq.nu
To: Discussion of precise time and frequency
measurement<time-nuts@febo..com>
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC
coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there
over
most of the sweep.
Bob
From: "SAL CORNACCHIA"salccor@rogers.com
Sent: Sunday, February 07, 2010 11:06 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo..com>
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: "Stan, W1LE"stanw1le@verizon.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website)
show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19)
connected in parallel with a small series resistor between the parallled
inverter outputs and the PPS connector.
Open the case and check the waveforms at the 74AC04 inputs and outputs.
Check the series resistor for continuity, also check the solder joint
between the BNC inner conductor and the PCB.
Bruce
Bruce Griffiths wrote:
> Any idea what the pulse shapes you see is with a 1M load and with a 50
> ohm load?
>
> Bruce
>
> SAL CORNACCHIA wrote:
>> Hi Didier,
>> When the 50 ohms termination is switch on the oscilloscope there is
>> a tiny positive dot deflecting every second, it appears to have a
>> very low output.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: Didier Juges<didier@cox.net>
>> To: Time-Nuts<time-nuts@febo.com>
>> Sent: Sun, February 7, 2010 11:51:15 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> The pulse is narrow, but it should be a full 5V amplitude. The driver
>> is pretty beefy, the amplitude does dot drop appreciably when loaded
>> with 50 ohms on mine.
>>
>> Didier KO4BB
>>
>> ------------------------ Sent from my BlackBerry Wireless thingy
>> while I do other things...
>>
>> -----Original Message-----
>> From: SAL CORNACCHIA<salccor@rogers.com>
>> Date: Sun, 7 Feb 2010 08:42:49
>> To: Discussion of precise time and frequency
>> measurement<time-nuts@febo.com>
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hi Bob,
>> The pulse is barely visible on the Tektronix 485 it appears to be a
>> very low output.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: Bob Camp<lists@cq.nu>
>> To: Discussion of precise time and frequency
>> measurement<time-nuts@febo..com>
>> Sent: Sun, February 7, 2010 11:26:16 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hi
>>
>> The 5345 should see it if it's set to 50 ohm termination and DC
>> coupling.. A
>> sweep of the trigger from about 1.5 to 3.5 volts should show it there
>> over
>> most of the sweep.
>>
>> Bob
>>
>> --------------------------------------------------
>> From: "SAL CORNACCHIA"<salccor@rogers.com>
>> Sent: Sunday, February 07, 2010 11:06 AM
>> To: "Discussion of precise time and frequency measurement"
>> <time-nuts@febo..com>
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
>>> Best regards,
>>> Sal C. Cornacchia
>>> Electronic RF Microwave Engineer (Ret.)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: "Stan, W1LE"<stanw1le@verizon.net>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts@febo.com>
>>> Sent: Sun, February 7, 2010 10:47:42 AM
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>> Hello Sal,
>>>
>>> What are you monitoring the PPS output with ??
>>>
>>> It is a short duration pulse.
>>>
>>> What does the TboltMON software (available at the trimble website)
>>> show ?
>>>
>>> What does Lady Heather indicate ?
>>> (She is just waiting to massage your numbers.)
>>>
>>> Stan, W1LE
>>>
>>>
>>>
>>
>
SC
SAL CORNACCHIA
Mon, Feb 8, 2010 1:32 AM
I cannot measure anything, with the scope set at max sensitivity, there is only a tiny dot indication every second.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bruce Griffiths bruce.griffiths@xtra.co.nz
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 7:45:26 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Juges<didier@cox..net>
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
Didier KO4BB
------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: SAL CORNACCHIAsalccor@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bob Camplists@cq.nu
To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there over
most of the sweep.
Bob
From: "SAL CORNACCHIA"salccor@rogers.com
Sent: Sunday, February 07, 2010 11:06 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo..com>
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: "Stan, W1LE"stanw1le@verizon.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
I cannot measure anything, with the scope set at max sensitivity, there is only a tiny dot indication every second.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
________________________________
From: Bruce Griffiths <bruce.griffiths@xtra.co.nz>
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Sent: Sun, February 7, 2010 7:45:26 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
> Hi Didier,
>
> When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
> Best regards,
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: Didier Juges<didier@cox..net>
> To: Time-Nuts<time-nuts@febo.com>
> Sent: Sun, February 7, 2010 11:51:15 AM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
>
> Didier KO4BB
>
> ------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
>
> -----Original Message-----
> From: SAL CORNACCHIA<salccor@rogers.com>
> Date: Sun, 7 Feb 2010 08:42:49
> To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Hi Bob,
> The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
> Best regards,
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: Bob Camp<lists@cq.nu>
> To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
> Sent: Sun, February 7, 2010 11:26:16 AM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Hi
>
> The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
> sweep of the trigger from about 1.5 to 3.5 volts should show it there over
> most of the sweep.
>
> Bob
>
> --------------------------------------------------
> From: "SAL CORNACCHIA"<salccor@rogers.com>
> Sent: Sunday, February 07, 2010 11:06 AM
> To: "Discussion of precise time and frequency measurement"
> <time-nuts@febo..com>
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
>
>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: "Stan, W1LE"<stanw1le@verizon.net>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts@febo.com>
>> Sent: Sun, February 7, 2010 10:47:42 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hello Sal,
>>
>> What are you monitoring the PPS output with ??
>>
>> It is a short duration pulse.
>>
>> What does the TboltMON software (available at the trimble website) show ?
>>
>> What does Lady Heather indicate ?
>> (She is just waiting to massage your numbers.)
>>
>> Stan, W1LE
>>
>>
>>
>>
>
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
SC
SAL CORNACCHIA
Mon, Feb 8, 2010 1:38 AM
What is the best way to measure or to see any display at the 1 PPS BNC connector, unfortunately I don't have a digital oscilloscope.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bruce Griffiths bruce.griffiths@xtra.co.nz
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 8:17:08 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19) connected in parallel with a small series resistor between the parallled inverter outputs and the PPS connector.
Open the case and check the waveforms at the 74AC04 inputs and outputs.
Check the series resistor for continuity, also check the solder joint between the BNC inner conductor and the PCB.
Bruce
Bruce Griffiths wrote:
Any idea what the pulse shapes you see is with a 1M load and with a 50 ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
Best regards,
Sal C.. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Jugesdidier@cox.net
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
Didier KO4BB
------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: SAL CORNACCHIAsalccor@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bob Camplists@cq.nu
To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there over
most of the sweep..
Bob
From: "SAL CORNACCHIA"salccor@rogers.com
Sent: Sunday, February 07, 2010 11:06 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo..com>
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: "Stan, W1LE"stanw1le@verizon.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
What is the best way to measure or to see any display at the 1 PPS BNC connector, unfortunately I don't have a digital oscilloscope.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
________________________________
From: Bruce Griffiths <bruce.griffiths@xtra.co.nz>
To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
Sent: Sun, February 7, 2010 8:17:08 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19) connected in parallel with a small series resistor between the parallled inverter outputs and the PPS connector.
Open the case and check the waveforms at the 74AC04 inputs and outputs.
Check the series resistor for continuity, also check the solder joint between the BNC inner conductor and the PCB.
Bruce
Bruce Griffiths wrote:
> Any idea what the pulse shapes you see is with a 1M load and with a 50 ohm load?
>
> Bruce
>
> SAL CORNACCHIA wrote:
>> Hi Didier,
>> When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
>> Best regards,
>> Sal C.. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: Didier Juges<didier@cox.net>
>> To: Time-Nuts<time-nuts@febo.com>
>> Sent: Sun, February 7, 2010 11:51:15 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
>>
>> Didier KO4BB
>>
>> ------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
>>
>> -----Original Message-----
>> From: SAL CORNACCHIA<salccor@rogers.com>
>> Date: Sun, 7 Feb 2010 08:42:49
>> To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hi Bob,
>> The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: Bob Camp<lists@cq.nu>
>> To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
>> Sent: Sun, February 7, 2010 11:26:16 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hi
>>
>> The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
>> sweep of the trigger from about 1.5 to 3.5 volts should show it there over
>> most of the sweep..
>>
>> Bob
>>
>> --------------------------------------------------
>> From: "SAL CORNACCHIA"<salccor@rogers.com>
>> Sent: Sunday, February 07, 2010 11:06 AM
>> To: "Discussion of precise time and frequency measurement"
>> <time-nuts@febo..com>
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
>>> Best regards,
>>> Sal C. Cornacchia
>>> Electronic RF Microwave Engineer (Ret.)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: "Stan, W1LE"<stanw1le@verizon.net>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts@febo.com>
>>> Sent: Sun, February 7, 2010 10:47:42 AM
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>> Hello Sal,
>>>
>>> What are you monitoring the PPS output with ??
>>>
>>> It is a short duration pulse.
>>>
>>> What does the TboltMON software (available at the trimble website) show ?
>>>
>>> What does Lady Heather indicate ?
>>> (She is just waiting to massage your numbers.)
>>>
>>> Stan, W1LE
>>>
>>>
>>>
>>
>
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
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JA
John Ackermann N8UR
Mon, Feb 8, 2010 1:45 AM
Sal, what sweep time are you using on the scope? I believe the TBolt
PPS is only microseconds wide, so you may need to speed up the sweep
time to around 100us/div or faster to see it accurately. And you may
need to mess with delaying the sweep to get the pulse on the screen.
John
SAL CORNACCHIA said the following on 02/07/2010 08:32 PM:
I cannot measure anything, with the scope set at max sensitivity, there is only a tiny dot indication every second.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bruce Griffiths bruce.griffiths@xtra.co.nz
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sun, February 7, 2010 7:45:26 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Any idea what the pulse shapes you see is with a 1M load and with a 50
ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Juges<didier@cox..net>
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
Didier KO4BB
------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: SAL CORNACCHIAsalccor@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bob Camplists@cq.nu
To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there over
most of the sweep.
Bob
From: "SAL CORNACCHIA"salccor@rogers.com
Sent: Sunday, February 07, 2010 11:06 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo..com>
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: "Stan, W1LE"stanw1le@verizon.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
Sal, what sweep time are you using on the scope? I believe the TBolt
PPS is only microseconds wide, so you may need to speed up the sweep
time to around 100us/div or faster to see it accurately. And you may
need to mess with delaying the sweep to get the pulse on the screen.
John
----
SAL CORNACCHIA said the following on 02/07/2010 08:32 PM:
> I cannot measure anything, with the scope set at max sensitivity, there is only a tiny dot indication every second.
>
> Best regards,
>
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
> ________________________________
> From: Bruce Griffiths <bruce.griffiths@xtra.co.nz>
> To: Discussion of precise time and frequency measurement <time-nuts@febo.com>
> Sent: Sun, February 7, 2010 7:45:26 PM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Any idea what the pulse shapes you see is with a 1M load and with a 50
> ohm load?
>
> Bruce
>
> SAL CORNACCHIA wrote:
>> Hi Didier,
>>
>> When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: Didier Juges<didier@cox..net>
>> To: Time-Nuts<time-nuts@febo.com>
>> Sent: Sun, February 7, 2010 11:51:15 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
>>
>> Didier KO4BB
>>
>> ------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
>>
>> -----Original Message-----
>> From: SAL CORNACCHIA<salccor@rogers.com>
>> Date: Sun, 7 Feb 2010 08:42:49
>> To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hi Bob,
>> The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
>> Best regards,
>> Sal C. Cornacchia
>> Electronic RF Microwave Engineer (Ret.)
>>
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: Bob Camp<lists@cq.nu>
>> To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
>> Sent: Sun, February 7, 2010 11:26:16 AM
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>> Hi
>>
>> The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
>> sweep of the trigger from about 1.5 to 3.5 volts should show it there over
>> most of the sweep.
>>
>> Bob
>>
>> --------------------------------------------------
>> From: "SAL CORNACCHIA"<salccor@rogers.com>
>> Sent: Sunday, February 07, 2010 11:06 AM
>> To: "Discussion of precise time and frequency measurement"
>> <time-nuts@febo..com>
>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>
>>
>>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
>>> Best regards,
>>> Sal C. Cornacchia
>>> Electronic RF Microwave Engineer (Ret.)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: "Stan, W1LE"<stanw1le@verizon.net>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts@febo.com>
>>> Sent: Sun, February 7, 2010 10:47:42 AM
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>> Hello Sal,
>>>
>>> What are you monitoring the PPS output with ??
>>>
>>> It is a short duration pulse.
>>>
>>> What does the TboltMON software (available at the trimble website) show ?
>>>
>>> What does Lady Heather indicate ?
>>> (She is just waiting to massage your numbers.)
>>>
>>> Stan, W1LE
>>>
>>>
>>>
>>>
>
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
BG
Bruce Griffiths
Mon, Feb 8, 2010 1:48 AM
The 10us wide PPS pulse from a thunderbolt shows up just fine on an
analog scope.
Using a traditional viewing hood (or equivalent) helps considerably if
one doesnt have a dark room.
Bruce
SAL CORNACCHIA wrote:
What is the best way to measure or to see any display at the 1 PPS BNC connector, unfortunately I don't have a digital oscilloscope.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bruce Griffithsbruce.griffiths@xtra.co.nz
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Sent: Sun, February 7, 2010 8:17:08 PM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The PPS driver appears to use at least 3 inverters from a 74AC04 (U19) connected in parallel with a small series resistor between the parallled inverter outputs and the PPS connector.
Open the case and check the waveforms at the 74AC04 inputs and outputs.
Check the series resistor for continuity, also check the solder joint between the BNC inner conductor and the PCB.
Bruce
Bruce Griffiths wrote:
Any idea what the pulse shapes you see is with a 1M load and with a 50 ohm load?
Bruce
SAL CORNACCHIA wrote:
Hi Didier,
When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
Best regards,
Sal C.. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Didier Jugesdidier@cox.net
To: Time-Nutstime-nuts@febo.com
Sent: Sun, February 7, 2010 11:51:15 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
Didier KO4BB
------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: SAL CORNACCHIAsalccor@rogers.com
Date: Sun, 7 Feb 2010 08:42:49
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi Bob,
The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Bob Camplists@cq.nu
To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
Sent: Sun, February 7, 2010 11:26:16 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hi
The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
sweep of the trigger from about 1.5 to 3.5 volts should show it there over
most of the sweep..
Bob
From: "SAL CORNACCHIA"salccor@rogers.com
Sent: Sunday, February 07, 2010 11:06 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo..com>
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Oscilloscope and 5345A Counter, the Tbolt software shows all green.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: "Stan, W1LE"stanw1le@verizon.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sun, February 7, 2010 10:47:42 AM
Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
Hello Sal,
What are you monitoring the PPS output with ??
It is a short duration pulse.
What does the TboltMON software (available at the trimble website) show ?
What does Lady Heather indicate ?
(She is just waiting to massage your numbers.)
Stan, W1LE
The 10us wide PPS pulse from a thunderbolt shows up just fine on an
analog scope.
Using a traditional viewing hood (or equivalent) helps considerably if
one doesnt have a dark room.
Bruce
SAL CORNACCHIA wrote:
> What is the best way to measure or to see any display at the 1 PPS BNC connector, unfortunately I don't have a digital oscilloscope.
>
> Best regards,
>
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: Bruce Griffiths<bruce.griffiths@xtra.co.nz>
> To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
> Sent: Sun, February 7, 2010 8:17:08 PM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> The PPS driver appears to use at least 3 inverters from a 74AC04 (U19) connected in parallel with a small series resistor between the parallled inverter outputs and the PPS connector.
> Open the case and check the waveforms at the 74AC04 inputs and outputs.
> Check the series resistor for continuity, also check the solder joint between the BNC inner conductor and the PCB.
>
> Bruce
>
> Bruce Griffiths wrote:
>
>> Any idea what the pulse shapes you see is with a 1M load and with a 50 ohm load?
>>
>> Bruce
>>
>> SAL CORNACCHIA wrote:
>>
>>> Hi Didier,
>>> When the 50 ohms termination is switch on the oscilloscope there is a tiny positive dot deflecting every second, it appears to have a very low output.
>>> Best regards,
>>> Sal C.. Cornacchia
>>> Electronic RF Microwave Engineer (Ret.)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: Didier Juges<didier@cox.net>
>>> To: Time-Nuts<time-nuts@febo.com>
>>> Sent: Sun, February 7, 2010 11:51:15 AM
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>> The pulse is narrow, but it should be a full 5V amplitude. The driver is pretty beefy, the amplitude does dot drop appreciably when loaded with 50 ohms on mine.
>>>
>>> Didier KO4BB
>>>
>>> ------------------------ Sent from my BlackBerry Wireless thingy while I do other things...
>>>
>>> -----Original Message-----
>>> From: SAL CORNACCHIA<salccor@rogers.com>
>>> Date: Sun, 7 Feb 2010 08:42:49
>>> To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>> Hi Bob,
>>> The pulse is barely visible on the Tektronix 485 it appears to be a very low output.
>>> Best regards,
>>> Sal C. Cornacchia
>>> Electronic RF Microwave Engineer (Ret.)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: Bob Camp<lists@cq.nu>
>>> To: Discussion of precise time and frequency measurement<time-nuts@febo..com>
>>> Sent: Sun, February 7, 2010 11:26:16 AM
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>> Hi
>>>
>>> The 5345 should see it if it's set to 50 ohm termination and DC coupling.. A
>>> sweep of the trigger from about 1.5 to 3.5 volts should show it there over
>>> most of the sweep..
>>>
>>> Bob
>>>
>>> --------------------------------------------------
>>> From: "SAL CORNACCHIA"<salccor@rogers.com>
>>> Sent: Sunday, February 07, 2010 11:06 AM
>>> To: "Discussion of precise time and frequency measurement"
>>> <time-nuts@febo..com>
>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>
>>>
>>>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
>>>> Best regards,
>>>> Sal C. Cornacchia
>>>> Electronic RF Microwave Engineer (Ret.)
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ________________________________
>>>> From: "Stan, W1LE"<stanw1le@verizon.net>
>>>> To: Discussion of precise time and frequency measurement
>>>> <time-nuts@febo.com>
>>>> Sent: Sun, February 7, 2010 10:47:42 AM
>>>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>>>>
>>>> Hello Sal,
>>>>
>>>> What are you monitoring the PPS output with ??
>>>>
>>>> It is a short duration pulse.
>>>>
>>>> What does the TboltMON software (available at the trimble website) show ?
>>>>
>>>> What does Lady Heather indicate ?
>>>> (She is just waiting to massage your numbers.)
>>>>
>>>> Stan, W1LE
>>>>
>>>>
>>>>
>>>>
>>>
>>
>
BG
Bruce Griffiths
Mon, Feb 8, 2010 1:56 AM
John Ackermann N8UR wrote:
Sal, what sweep time are you using on the scope? I believe the TBolt
PPS is only microseconds wide, so you may need to speed up the sweep
time to around 100us/div or faster to see it accurately. And you may
need to mess with delaying the sweep to get the pulse on the screen.
John
You would need to delay the sweep by 0.999999s to get the leading edge
on screen if the internal scope vertical delay line is insufficient.
With a sweep speed of 2us/div the entire pulse is clearly visible (even
without a viewing hood and light from a window (overcast sky) falling
directly on the screen) without any delayed sweep.
NB trigger on the leading edge which has a positive slope.
Bruce
John Ackermann N8UR wrote:
> Sal, what sweep time are you using on the scope? I believe the TBolt
> PPS is only microseconds wide, so you may need to speed up the sweep
> time to around 100us/div or faster to see it accurately. And you may
> need to mess with delaying the sweep to get the pulse on the screen.
>
> John
> ----
>
You would need to delay the sweep by 0.999999s to get the leading edge
on screen if the internal scope vertical delay line is insufficient.
With a sweep speed of 2us/div the entire pulse is clearly visible (even
without a viewing hood and light from a window (overcast sky) falling
directly on the screen) without any delayed sweep.
NB trigger on the leading edge which has a positive slope.
Bruce
CP
Charles P. Steinmetz
Mon, Feb 8, 2010 2:02 AM
The [PPS] pulse is barely visible on the Tektronix 485 it appears to
be a very low output.
The PPS output can be turned off. Are you sure it is turned
on? (Check with Tboltmon or Lady Heather.)
Best regards,
Charles
Sal wrote:
>The [PPS] pulse is barely visible on the Tektronix 485 it appears to
>be a very low output.
The PPS output can be turned off. Are you sure it is turned
on? (Check with Tboltmon or Lady Heather.)
Best regards,
Charles
BC
Bob Camp
Mon, Feb 8, 2010 3:19 AM
HI
A lot depends on just how tired the tube in your scope is. Some of these scopes have spent a lot of hours turned on and wearing out the filament ....
The easy thing to do is to vary the trigger point and watch the "trigger" light. It should tell you if the pulse is there or not. If it's not, then either it's turned off or there's something keeping the electrons from getting to you (like a blown chip).
Bob
On Feb 7, 2010, at 8:56 PM, Bruce Griffiths wrote:
John Ackermann N8UR wrote:
Sal, what sweep time are you using on the scope? I believe the TBolt PPS is only microseconds wide, so you may need to speed up the sweep time to around 100us/div or faster to see it accurately. And you may need to mess with delaying the sweep to get the pulse on the screen.
John
You would need to delay the sweep by 0.999999s to get the leading edge on screen if the internal scope vertical delay line is insufficient.
With a sweep speed of 2us/div the entire pulse is clearly visible (even without a viewing hood and light from a window (overcast sky) falling directly on the screen) without any delayed sweep.
NB trigger on the leading edge which has a positive slope.
Bruce
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
HI
A lot depends on just how tired the tube in your scope is. Some of these scopes have spent a lot of hours turned on and wearing out the filament ....
The easy thing to do is to vary the trigger point and watch the "trigger" light. It should tell you if the pulse is there or not. If it's not, then either it's turned off or there's something keeping the electrons from getting to you (like a blown chip).
Bob
On Feb 7, 2010, at 8:56 PM, Bruce Griffiths wrote:
> John Ackermann N8UR wrote:
>> Sal, what sweep time are you using on the scope? I believe the TBolt PPS is only microseconds wide, so you may need to speed up the sweep time to around 100us/div or faster to see it accurately. And you may need to mess with delaying the sweep to get the pulse on the screen.
>>
>> John
>> ----
>>
> You would need to delay the sweep by 0.999999s to get the leading edge on screen if the internal scope vertical delay line is insufficient.
>
> With a sweep speed of 2us/div the entire pulse is clearly visible (even without a viewing hood and light from a window (overcast sky) falling directly on the screen) without any delayed sweep.
> NB trigger on the leading edge which has a positive slope.
>
> Bruce
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
EP
Ed Palmer
Mon, Feb 8, 2010 3:47 AM
Sal:
I agree with Bob's suggestion below. Set your trigger mode to normal
rather than auto and use DC coupling, not AC. Set a slow sweep speed so
it's easy to see (maybe 10ms per division). You should see a sweep
every second. By varying the trigger level control you can get an idea
of the pulse's voltage even if you can't see it.
Ed
Bob Camp wrote:
HI
A lot depends on just how tired the tube in your scope is. Some of these scopes have spent a lot of hours turned on and wearing out the filament ....
The easy thing to do is to vary the trigger point and watch the "trigger" light. It should tell you if the pulse is there or not. If it's not, then either it's turned off or there's something keeping the electrons from getting to you (like a blown chip).
Bob
On Feb 7, 2010, at 8:56 PM, Bruce Griffiths wrote:
John Ackermann N8UR wrote:
Sal, what sweep time are you using on the scope? I believe the TBolt PPS is only microseconds wide, so you may need to speed up the sweep time to around 100us/div or faster to see it accurately. And you may need to mess with delaying the sweep to get the pulse on the screen.
John
You would need to delay the sweep by 0.999999s to get the leading edge on screen if the internal scope vertical delay line is insufficient.
With a sweep speed of 2us/div the entire pulse is clearly visible (even without a viewing hood and light from a window (overcast sky) falling directly on the screen) without any delayed sweep.
NB trigger on the leading edge which has a positive slope.
Bruce
Sal:
I agree with Bob's suggestion below. Set your trigger mode to normal
rather than auto and use DC coupling, not AC. Set a slow sweep speed so
it's easy to see (maybe 10ms per division). You should see a sweep
every second. By varying the trigger level control you can get an idea
of the pulse's voltage even if you can't see it.
Ed
Bob Camp wrote:
> HI
>
> A lot depends on just how tired the tube in your scope is. Some of these scopes have spent a lot of hours turned on and wearing out the filament ....
>
> The easy thing to do is to vary the trigger point and watch the "trigger" light. It should tell you if the pulse is there or not. If it's not, then either it's turned off or there's something keeping the electrons from getting to you (like a blown chip).
>
> Bob
>
>
> On Feb 7, 2010, at 8:56 PM, Bruce Griffiths wrote:
>
>
>> John Ackermann N8UR wrote:
>>
>>> Sal, what sweep time are you using on the scope? I believe the TBolt PPS is only microseconds wide, so you may need to speed up the sweep time to around 100us/div or faster to see it accurately. And you may need to mess with delaying the sweep to get the pulse on the screen.
>>>
>>> John
>>> ----
>>>
>>>
>> You would need to delay the sweep by 0.999999s to get the leading edge on screen if the internal scope vertical delay line is insufficient.
>>
>> With a sweep speed of 2us/div the entire pulse is clearly visible (even without a viewing hood and light from a window (overcast sky) falling directly on the screen) without any delayed sweep.
>> NB trigger on the leading edge which has a positive slope.
>>
>> Bruce
>>
>>
